linux-kernel - Re: [RFC PATCH] memory driver: make phys_index/end_phys_index reflect the start/end section number

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Date:	Fri, 4 Apr 2014 10:29:50 +0900
From:	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
To:	Li Zhong <zhong@...ux.vnet.ibm.com>
CC:	LKML <linux-kernel@...r.kernel.org>, <nfont@...ux.vnet.ibm.com>,
	<gregkh@...uxfoundation.org>
Subject: Re: [RFC PATCH] memory driver: make phys_index/end_phys_index reflect
 the start/end section number

(2014/04/02 17:56), Li Zhong wrote:
> I noticed the phys_index and end_phys_index under
> /sys/devices/system/memory/memoryXXX/ have the same value, e.g.
> (for the test machine, one memory block has 8 sections, that is
>   sections_per_block equals 8)
>
> # cd /sys/devices/system/memory/memory100/
> # cat phys_index end_phys_index
> 00000064
> 00000064
>
> Seems they should reflect the start/end section number respectively, which
> also matches what is said in Documentation/memory-hotplug.txt
>
> This patch tries to modify that so the two files could show the start/end
> section number of the memory block.
>
> After this change, output of the above example looks like:
>
> # cat phys_index end_phys_index
> 00000320
> 00000327
>
> Signed-off-by: Li Zhong <zhong@...ux.vnet.ibm.com>
> ---

Good catch! This is a bug. So I think the bug should be fixed.

Reviewed-by: Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>

Thanks,
Yasuaki Ishimatsu

>   drivers/base/memory.c | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/base/memory.c b/drivers/base/memory.c
> index bece691..b10f2fa 100644
> --- a/drivers/base/memory.c
> +++ b/drivers/base/memory.c
> @@ -114,7 +114,7 @@ static ssize_t show_mem_start_phys_index(struct device *dev,
>   	struct memory_block *mem = to_memory_block(dev);
>   	unsigned long phys_index;
>
> -	phys_index = mem->start_section_nr / sections_per_block;
> +	phys_index = mem->start_section_nr;
>   	return sprintf(buf, "%08lx\n", phys_index);
>   }
>
> @@ -124,7 +124,7 @@ static ssize_t show_mem_end_phys_index(struct device *dev,
>   	struct memory_block *mem = to_memory_block(dev);
>   	unsigned long phys_index;
>
> -	phys_index = mem->end_section_nr / sections_per_block;
> +	phys_index = mem->end_section_nr;
>   	return sprintf(buf, "%08lx\n", phys_index);
>   }
>
>
>
> --
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